Captcha interface [#20653]

The attached patch provides the Captcha module with a two-part interface to other modules.

First, it defines two functions that other modules can call to present a captcha challenge. (For example, I have written an input filter module that encodes email addresses to protect them from spam harvesters; using this interface, it can present a captcha challenge before revealing the email address.) This interface consists of two functions: captcha_form(), which generates form items for the challenge, and captcha_test(), which tests the user's response.

Second, it defines a hook interface so that other modules can implement different captcha tests. (At present, the administrator selects which available test to use; in the future, this could be extended to, for example, permit visually impaired users to choose an alternative to the default image recognition challenge.) As an example, I have converted the arithmetic test from an earlier version of captcha.module into a captcha plug-in.

Comment	File	Size	Author
#2	captcharith.module	3.04 KB	kps
#1	safemail.module	4.75 KB	kps
	captcha-api.patch	8.78 KB	kps

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Comments

Comment #1

kps CreditAttribution: kps commented 16 April 2005 at 22:29

File	Size
safemail.module	4.75 KB

Attached to this comment is an example of a module that uses the captcha interface defined in the above patch. This module encodes email addresses to protect them from spam harvesting. [Note: this example module is a work in progress.]

Comment #2

kps CreditAttribution: kps commented 16 April 2005 at 22:31

File	Size
captcharith.module	3.04 KB

Attached to this comment is a sample module that uses the hook interface defined in the patch above. This module is a plug-in captcha test that asks a simple arithmetic question; this makes the captcha module usable on systems without the GD image library. (This code is derived from an earlier version of captcha.module.)